System-S universal tripod adapter attachment bracket Stand Mount Tripod Adapter for Mobile Smartphone Tablet PC PDA Ebook Reader (Personal Computers) 5
I use it as a holder for a Nexus 7 on my camera tripod for tethered shooting and find it highly recommended for:
+ Maintains the tablet stable + 1/4 "thread to connect it on camera or tripod accessories + Folds up flat, other mounts can be very cumbersome. + Very easy + Relatively cheap